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在学生学习数学过程中,我们不难发现,一些很简单的运算,学生却常常计算出错。例如,56+30=26,24×5=100,二六十八。问学生为什么会出错?学生大多回答都是“粗心了”。这些现象很让老师头疼。其实“粗心”仅仅是表象,反映出的实质是学生的数感太差。如果他们掌握了重要的估算技能和对数的充分感知,也许就不会错了。什么是数感呢?《新课标》中对此作了说明:数感的具体体现是,理解数的意义;能用多种方法来表
As students learn mathematics, it’s not hard to find that some simple calculations are often made by students. For example, 56 + 30 = 26,24 × 5 = 100, two sixteen eighteen. Why do students make mistakes? Most students answer are “careless ”. These phenomena make the teacher a headache. In fact, “careless ” is just an image, reflecting the essence of the number of students feeling bad. If they have mastered the important estimation skills and the full awareness of logarithms, it may not be wrong. What is the sense of the number? “New Curriculum” in the description of this: the specific embodiment of the number sense is to understand the significance of the number; can use a variety of methods to the table